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  1. M

    Mercruiser 7.4MPI Compression after head gasket replacement

    I have a 1998 7.4 mpi sn 0L042350. The long block was replaced in 2016 with a Mercury reman by a Mercury shop. I recently rebuilt the top end because I had been experiencing some performance loss and confirmed that coolant was getting into some of the cylinders. The rebuild went well, but the...
  2. M

    7.4mpi head torque

    Thanks for the table, Scott
  3. M

    7.4mpi head torque

    Hi Doctur, this is what I was going off of. The bolts definitely turned more than I would have expected for the final torque sequence, and the one sheared. Ordered a new set of head bolts, Felpro ES72264. These are identical to what I pulled from the engine. Engine was a reman longblock...
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    7.4mpi head torque

    Thanks for the replies. Can you tell me, where do your numbers come from? Again, the numbers I was using come from the Mercruiser shop manual, number 23, so I’m trying to figure out what I should be following if not that.
  5. M

    7.4mpi head torque

    Hi all, I have a 1998 7.4 mpi sn 0L042350. I had to replace the head gaskets, and I ran into a problem on reinstallation. I was following the mercruiser factory service manual 90-861326-1 torque specs, and one of the bolts sheared. Questions: Is the torque spec in this manual correct for my...
  6. M

    3.0 GS High Oil Pressure

    I picked up an old Fiberform with a new(er) Volvo Penta 3.0GS. Quickly learning the new boat owner adage. I've reached a problem I'm not sure I know the cure for, and I'm hoping for some advice here. I'll go for the main issue here, and then provide some history. The oil pressure at the...
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